ERROR 2061 (HY000): Authentication plugin 'caching_sha2_password' reported error: Authentication requires secure connection.
1. Remove the repluser
drop user 'repluser'@'HOSTNAME';
flush privileges;
2. Confirm the repluser has been dropped
select user from mysql.user;
3. Manually create the user with the hostname and IP address
create user 'repluser'@'HOSTNAME' identified with mysql_native_password by 'PASSWORD';
create user 'repluser'@'IP' identified with mysql_native_password by 'PASSWORD';
GRANT REPLICATION SLAVE, REPLICATION CLIENT, SELECT, LOCK TABLES, RELOAD ON *.* TO 'repluser'@'HOSTNAME';
GRANT REPLICATION SLAVE, REPLICATION CLIENT, SELECT, LOCK TABLES, RELOAD ON *.* TO 'repluser'@'IP';
4. Confirm you can log in to MySQL witrh the repluser
mysql -u repluser -p -h HOSTNAME